Where should Metal Gear go next?

Aside from AC!D and other offshoots, what should the next proper Metal Gear game be?

After MGS4, I'd say that there are 5 distinct possibilities for the series to follow:
1. a 3-D remake of the original Metal Gear (MSX version)
2. a 3-D remake of Metal Gear 2: Solid Snake (MSX version)
3. a Revolver Ocelot game set after MGS: Portable Ops revolving around the formation of the Patriots
4. a Raiden game set after the events of MGS4
5. a game starring The Boss set during WWII

OMG. I would cry if that where to happen! That would be a SERIOUS boost to the weak software with the PSP right now. Man it would be great to have something like that out this Christmas for the PSP :\ I haven't touched mine in almost a year.

With the announcement of Touch, it just doesn't have that strong narrative appeal that a new full-fledged game would deliver.

A Metal Gear game featuring the Boss would be the most emotionally-charged title in the series, even MGS4. Set during WWII and in the early days of the Cold War, you'd the control the mother of CQC (close-quaters combat), so gameplay would feel like a traditional Metal Gear Solid game. Reliving memorable WWII moments but from the perspective of her legendary Cobra unit, would be great. Maybe the End missed a shot on Hitler. And in true Kojima fashion, there would be political intrigue from behind the scenes. Perhaps FDR didn't die of polio and that was just a convenient cover story. Maybe those polio shots given to kids in the 50s had a primitive form of nano-control in them through chemical control, but failed thus ultimately leading to FOXDIE. Back to the battlefield, actually control the Boss as she gives herself a c-section to give birth to Ocelot. With the onset of the Cold War, the Boss and the Sorrow, her lover and father to Ocelot, had to return to their opposing sides, the U.S. and the U.S.S.R. Then, the Boss, a.k.a. the Joy, was sent to kill the Sorrow, something she didn't want to do but orders were orders. The Sorrow even let her, sacrificing himself so she could complete her mission. Much like when Naked Snake killed the Boss (when he killed her was the moment that he died), when the Joy killed the Sorrow, so too did the Joy die.